Which of these properties is the best measure of a star's brightness?(1 point)
Responses
age
age
absolute magnitude
absolute magnitude
apparent magnitude
apparent magnitude
size
size
Question 2
Which of these phrases describes the sun?(1 point)
Responses
Class G yellow star
Class G yellow star
Class O blue star
Class O blue star
Class M red star
Class M red star
Class A white star
Class A white star
Question 3
How is the sun classified on an Hertzsprung-Russell Diagram?(1 point)
Responses
as a white dwarf star
as a white dwarf star
as a main sequence star
as a main sequence star
as a supergiant star
as a supergiant star
as a giant star
as a giant star
Question 4
Use the diagram to answer the question.
The Hertzsprung-Russell Diagram shows the spectral class of stars across the top, the temperature in Kellvin of stars across the bottom. The luminosity of stars, with the luminosity of the Sun equal to one, on the right, and the absolute magnitude of stars on the right. Blue giants, red supergiants, red giants, main sequence stars, the Sun, and white dwarfs are shown on the diagram.
Which type of star is in spectral class K and has a luminosity of 106?
(1 point)
Responses
red supergiant
red supergiant
red giant
red giant
white dwarf
white dwarf
blue giant
blue giant
Question 5
Use the diagram to answer the question.
The Hertzsprung-Russell Diagram shows the spectral class of stars across the top, the temperature in Kellvin of stars across the bottom. The luminosity of stars, with the luminosity of the Sun equal to one, on the right, and the absolute magnitude of stars on the right. Blue giants, red supergiants, red giants, main sequence stars, the Sun, and white dwarfs are shown on the diagram.
Which piece of spectral data is necessary to determine the spectral class of a star?
(1 point)
Responses
apparent magnitude
apparent magnitude
absolute magnitude
absolute magnitude
luminosity
luminosity
temperature
temperature
Question 6
Use the diagram to answer the question.
The Hertzsprung-Russell Diagram is shown. The left y-axis is labeled luminosity and the right y-axis is labeled absolute magnitude. The bottom x-axis is labeled with temperature left parenthesis Kelvin right parenthesis. The temperatures along the bottom are 40,000, 20,000, 10,000, 7,500, 5,500, 4,500, and 3,000. The top x-axis is labeled spectral class. The spectral classes labeled along the top from left to right are O, B, A, F, G, K, and M. Spectral class O lines up with a temperature of 40,000 K. Spectral class B lines up with a temperature of 20,000 K. Spectral class A lines up with a temperature of 10,000 K. Spectral class F lines up with a temperature of 7,500 K. Spectral class G lines up with a temperature of 5,500 K. Spectral class K lines up with a temperature of 4,500 K. Spectral class M lines up with a temperature of 3,000 K. Stars of different luminosity, absolute magnitude, spectral classes, and temperatures are plotted on the graph. Red giants and supergiants are shown in the upper right quadrant, indicating lower temperatures. White dwarfs are shown in the lower left quadrant, indicating higher temperatures and lower luminosity. Different main sequence stars are shown, ranging from hot and bright in the upper left quadrant to cooler and dimmer in lower right quadrant.
Which spectral class does a star fit into if it has a surface temperature of 20,000 K?
(1 point)
Responses
M
M
A
A
G
G
B
B
1 answer
Here are the answers to your questions:
Question 1: Which of these properties is the best measure of a star's brightness?
- Answer: apparent magnitude
Question 2: Which of these phrases describes the sun?
- Answer: Class G yellow star
Question 3: How is the sun classified on a Hertzsprung-Russell Diagram?
- Answer: as a main sequence star
Question 4: Which type of star is in spectral class K and has a luminosity of 106?
Question 5: Which piece of spectral data is necessary to determine the spectral class of a star?
Question 6: Which spectral class does a star fit into if it has a surface temperature of 20,000 K?
Feel free to ask if you have more questions!
